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Fix rare segfault on package removal 

Very rarely a segfault would occur when removing a number of packages
due to a corrupted list for the local database (FS#27805, FS#28195).
This was caused by the alpm_list_msort function not correctly dealing
with the two new head node's prev values.

Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>
This commit is contained in:
Allan McRae 2012-02-01 03:11:47 +10:00 committed by Dan McGee
parent 9d1e8084df
commit fcbae69fe8
1 changed files with 4 additions and 1 deletions
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5
lib/libalpm/alpm_list.c
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@ -279,8 +279,11 @@ alpm_list_t SYMEXPORT *alpm_list_msort(alpm_list_t *list, size_t n, alpm_list_fn
alpm_list_t *left = list;
alpm_list_t *lastleft = alpm_list_nth(list, n/2 - 1);
alpm_list_t *right = lastleft->next;
/* terminate first list */
/* tidy new lists */
lastleft->next = NULL;
right->prev = left->prev;
left->prev = lastleft;
left = alpm_list_msort(left, n/2, fn);
right = alpm_list_msort(right, n - (n/2), fn);